这里笔者介绍利用SpringMVC上传图片的操作。

步骤

1. 引入jar文件

不仅需要导入开发SpringMVC相关的包，还需要导入 commons-fileupload-1.2.1.jar 和 commons-io-1.3.2.jar 包

2. 配置applicationContext.xml

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

3. 编写html文件:

需要注意: 提交文件, 只能使用POST方式, 并且要指定enctype="multipart/form-data"
例如：

    <form action="file.do" method="POST" enctype="multipart/form-data">

        请选择您要上传的文件:<br><br>

        <input type="file" name="file"/><br>

        <input type="submit"/>

    </form>

4. 编写接收上传文件的Controller了 ,接收的文件的类型: MultipartFile

例如：

@RequestMapping("/file.do")

public String fileUpload(MultipartFile file){

    //上传的文件: file

    System.out.println("上传的文件名称为:"+file.getOriginalFilename());

    return "result";

}

Demo

下面是一个接受上传图片的Demo，该Demo能够把用户上传的图片存储到部署项目的根目录下面。那么如何查看自己项目的根目录：点击项目->.metadata->.plugins->org.eclipse.wst.server.core->tmp0->wtpwebapps ，在里面就可以看到部署的项目了。

jsp文件：

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

    文件上传成功:${imagePath }

</body>

</html>

fileUploadOk.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

    文件过大, 请上传1M以内的图片

</body>

</html>

fileUploadError.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>上传错误</title>

</head>

<body>

请上传图片类型~ .jpg .png .jpeg

</body>

</html>

error.jsp

文件上传表单：

<%@ page language="java" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>文件上传</title>

</head>

<body>

<form action="fileupload.do" method="POST" enctype="multipart/form-data">

<input type="file" name="file"/>

<input type="submit" value="提交"/>

</form>

</body>

</html>

fileUpload.jsp

dispatcherServlet-servlet.xml文件：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd

        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

     <!--指定注解扫描包-->

     <context:component-scan base-package="cn"></context:component-scan>

     <!--开启注解扫描-->

     <mvc:annotation-driven/>

     <!--配置视图-->

  <bean id="viewResolver"    class="org.springframework.web.servlet.view.InternalResourceViewResolver">

    <property name="viewClass">

      <value>org.springframework.web.servlet.view.InternalResourceView</value>

    </property>

    <!--jsp存放的目录-->

    <property name="prefix">

      <value></value>

    </property>

    <!--jsp文件的后缀-->

    <property name="suffix">

      <value>.jsp</value>

    </property>

  </bean>

     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

</beans>

dispatcherServlet-servlet.xml

web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">

  <display-name>SpringMVC_FileUpLoad</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

  </welcome-file-list>

  <servlet>

      <servlet-name>dispatcherServlet</servlet-name>

      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

  </servlet>

  <servlet-mapping>

      <servlet-name>dispatcherServlet</servlet-name>

      <url-pattern>*.do</url-pattern>

  </servlet-mapping>

</web-app>

web.xml

FileController.java控制器文件：

package cn.xdl.Controller;

import java.io.File;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.multipart.MultipartFile;

@Controller

public class FileController {

    @RequestMapping("/fileupload.do")

    public String fileUpload(MultipartFile file,HttpServletResponse response,HttpServletRequest request){

        //判断文件的类型------------------//

        String fileName = file.getOriginalFilename();

        if(fileName.endsWith(".jpeg")||fileName.endsWith(".png")||fileName.endsWith(".jpg")){

        //判断文件的类型------------------//

            //上传的是图片

        //图片大小的判断---------------------//

            System.out.println("上传的图片的大小为: "+ file.getSize());

            int size = 1024*1024;

            //文件大小是否过大 , true表示过大

            boolean flag = false;

            if(file.getSize()<Integer.MAX_VALUE){

                int fileSize = (int) file.getSize();

                if(fileSize>size){

                    //文件过大

                    flag = true;

                }else{

                    //大小合适

                    flag = false;

                }

            }else{

                //文件大小过大

                flag = true;

            }

            //文件过大 则响应错误页面

            if(flag){

                //文件过大

                return "redirect:fileUploadError.jsp";

            }else{

                //文件大小正常 ,将文件存储到项目当前运行目录下

                String dirPath = request.getServletContext().getRealPath("/");//获取当前项目运行时的目录  // 获取到的目录: webContent目录

                System.out.println(dirPath);

                File imgDir = new File(dirPath+"/images");

                if(!imgDir.exists())

                    imgDir.mkdirs();

                try {

                    fileName = fileName.replace(".", ",");

                    String newFileName = System.currentTimeMillis()+"."+(fileName.split(",")[fileName.split(",").length-1]);

                    file.transferTo(new File(imgDir,newFileName ));

                    request.getSession().setAttribute("imagePath", "<a href='images/"+newFileName+"'>点击查看</a>");

                    return "redirect:fileUploadOk.jsp";

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }

        }else{

            //上传的是其他文件

            System.out.println("上传的不是图片");

        }

        return "error";

    }

}

FileController.java

巴特西

【Spring】SpringMVC之上传文件

步骤

1. 引入jar文件

2. 配置applicationContext.xml

3. 编写html文件:

4. 编写接收上传文件的Controller了 ,接收的文件的类型: MultipartFile

Demo

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